Received September 3, 2014; revised October 8, 2014; accepted October 13, 2014

Abstract

V1073 Herculis is a very short period, P = 0.294281673(4) day, active solar type eclipsing binary. It was observed in May 2012 with the Lowell Observatory 31-inch NURO reflector. This period study consists of some 54 times of minimum light covering nearly 18,000 orbits. A very low amplitude, 0.002-day sinusoidal variation is detected with a period of 11.25 years, which may indicate the presence of a dwarf third component. The temperature of the binary is ~5200K. A preliminary simultaneous Wilson-Devinney Program solution including a q-search reveals that the system has a mass ratio of 0.4, nearly identical component temperatures, and a cool magnetic spot with a T-factor of 0.86 with a spot radius of 22 degrees. The Roche Lobe fill-out is 0.18. The inclination is 82 degrees which results in a brief total eclipse.